WordReference Random House Unabridged Dictionary of American English © 2020
aceto-, 
  • Chemistrya combining form with the meanings "vinegar,'' "acetic acid,'' used in the formation of compound words (acetometer), esp. in the names of chemical compounds in which acetic acid or the acetyl group is present (acetophenetidin).
  • Also,[esp. before a vowel,] acet-. 
    • Latin acēt(um) vinegar + -o-. Cf. acid, acescent

    Collins Concise English Dictionary © HarperCollins Publishers::
    aceto-, (before a vowel)acet- combining form
    1. containing an acetyl group or derived from acetic acid: acetone
    Etymology: from Latin acētum vinegar
    'aceto-' also found in these entries:
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